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Take a number, then square each of its digits, then add them back together. (e.g. 34-> 3^2+4^2=9+16=25)
1 of two things happens: Either it gets stuck in a loop (at which point it is called a "sad number") or it reaches 1 (at which point it is a "happy number").
I used to spend my free time in class finding every happy number I could. Try it if you want.
1 of two things happens: Either it gets stuck in a loop (at which point it is called a "sad number") or it reaches 1 (at which point it is a "happy number").
I used to spend my free time in class finding every happy number I could. Try it if you want.